BACKGROUND OF THE INVENTION
1. Field of the Invention
[0001] The present invention relates to a vertebra retaining device, and more particularly
to a staged expansion vertebra retaining device for dispersing the applied force of
the graft operation effectively. The vertebra retaining device is adjustable for the
height of the vertebra, which can be adapted for most people. The vertebra retaining
device is labor-saving, precise, and quick for a graft operation.
2. Description of the Prior Art
[0002] Due to age, accident, sports, poor posture for a long period, or occupational injuries,
etc., the human spine is easy to appear spine dislocation, cartilage degradation,
hyperostosis, particularly elderly degenerative spinal disease. Sometimes, it may
cause serious complications, such as dysfunction of other organs of the body. In order
to solve the degenerative diseases of the spine due to old age or other external forces,
an intervertebral fusion surgery is required or an artificial intervertebral disk
is grafted in between a pair of vertebral bodies.
[0003] TW Patent No. M414944,
M411920,
M409825,
M400307 and
M38401 disclose a vertebral graft instead of the original intervertebral disk of the human
body. The vertebral graft is grafted in between two vertebral bodies or lumbar vertebras
to provide a support and buffer function. However, the distance between two vertebral
bodies is different. The vertebral graft has a fixed and single size, which may be
too tight or loose when used for a graft operation.
[0004] U.S. Patent No. 5554191 discloses an intersomatic vertebral cage. As shown in the drawings, the intersomatic
vertebral cage comprises a support main body 3 and a screw 36. The support main body
3 comprises two support portions 31, 32 having serrated surfaces 312, 313 thereon.
The open ends of the two support portions 31, 32 have inclined guide surfaces 310,
320 to form a V-shaped opening 342. The screw 36 is inserted in the support main body
3. One end of the screw 36 extends out of the two support portions 31, 32 and is coupled
with an expansion member 37. The expansion member 37 is normally against the two inclined
guide surfaces 310, 320. When the intersomatic vertebral cage is grafted in between
two vertebral bodies, the screw 36 is rotated by a tool 4 to expand the two support
portions 31, 32 at an appropriate angle for holding the two vertebral bodies in place.
[0005] This structure has the angle expansion structure to solve the problem that the distance
and size between two vertebral bodies are different. When it is used for a graft operation,
the two support portions 31, 32 must be first expanded to hold two vertebral bodies,
and then the screw is rotated continuously for expansion. However, both the two support
portions 31, 32 are a one-piece structure. For the graft operation, it is necessary
to apply a great force to expand the two support portions 31, 32 so as to hold the
two vertebral bodies, namely, it is laborious for operation. During the graft operation,
the intersomatic vertebral cage cannot be aligned and positioned precisely because
of a slide caused by the excessive applied force. Sometimes, a readjustment is required,
which increases the difficulty of the operation and extends the operation time and
causes the patient a burden.
[0006] Accordingly, the inventor of the present invention has devoted himself based on his
many years of practical experiences to solve this problem.
[0007] US 2010/0286780 A1 discloses an expendable spinal implant comprising a cage body including at least
two movable branches having first end portions that are interconnected to one another
and second end portions that are movable relative to one another. The movable branches
include a first shell portion having a first pair of longitudinal edges and defining
a first hollow region therebetween and a second shell portion having a second pair
of longitudinal edges and defining a second hollow region therebetween with the first
and second hollow region is cooperating to define at least a portion of a hollow interior
of the cage body. An expansion member co-acts with the first and second shell portions
to transition the cage body to an expanded configuration as the expansion member is
actually displaced along the first and second pairs of longitudinal edges.
[0008] US 2005/0113916 A1 discloses an extended spinal planned including a body having a plurality of portions
cooperating to define an outer cross-section having a first and a second Traverse
dimension and the first and second substantially planar surface is disposed generally
opposite to another and adapted to engage adjacent
vertebral bodies. And Nick member collects with the movable portions to expand the
body along each of the first and second traverse dimensions.
[0009] US 2002/0143401 A1 discloses a staged expansion vertebra retaining device according to the preamble
of claim 1. The staged expansion vertebra retaining device, wherein the staged expansion
vertebra retaining device comprises a main body and a screw inserted into the main
body, a distal end of the screw is provided with a push block, the main body has a
transverse slot extending backward from a front end thereof to form at least two movable
support units relative to one side of the push block, each movable support unit is
split by a groove to form at least two movable support surfaces which are able to
be expanded in a staged manner by the push block, so that the movable support units
are expanded at an angle to hold two adjacent vertebral bodies in place, wherein,
wherein an open end of the transverse slot is formed with an enlarged portion for
the push block to be transversely disposed and screwed to the distal end of the screw.
SUMMARY OF THE INVENTION
[0010] The primary object of the present invention is to provide a staged expansion vertebra
retaining device for dispersing the applied force of the graft operation effectively.
The present invention is adjustable for the height of the vertebra, which can be adapted
for most people. The present invention is labor-saving, precise, and quick for a graft
operation.
[0011] A further object of the present invention is to provide a staged expansion vertebra
retaining device to shorten the graft operation time effectively.
[0012] The object of the invention is achieved by the subject matter of claim 1. Advantageous
embodiments are disclosed by the dependent claims.
[0013] In order to achieve the aforesaid objects, a staged expansion vertebra retaining
device is provided. The staged expansion vertebra retaining device of the present
invention comprises a main body and a screw inserted into the main body. The distal
end of the screw is provided with a push block. The main body has a traverse slot
extending backward from a front end thereof to format least two movable support units
relative to one side of the push block. Each movable support unit is split by a groove
to form at least two movable support surfaces which are able to be expanded in a staged
manner by the push block, so that the movable support units are expanded at an angle
to hold two adjacent vertebral bodies in place. An open end of the transverse slot
is formed with an enlarged portion for the push block to be transversely disposed
and screwed to the distal end of the screw. The at least two movable surfaces comprise
a movable support surface which is an innermost movable support surface and a frame
shaped-moveable support surface which is an outermost movable support surface, and
the inner surfaces of the movable support surfaces have at least two guide surfaces
connecting the transverse slot and the enlarged portion and spaced at an interval
for guiding the push block, by bringing the push block to move inward the first guide
surface is pushed so that the innermost movable support surface is first expanded
at an appropriate angle and when the push block is translated to move inward until
the guide surface of the outermost movable support surface, the movable support surfaces
are simultaneously expanded outward by the push block.
[0014] Preferably, the movable support surfaces have guide surfaces spaced at an interval
for guiding the push block.
[0015] Preferably, the guide surfaces are inclined stepped guide surfaces.
[0016] Preferably, the guide surfaces are inclined guide surfaces.
[0017] Preferably, the guide surfaces are curved guide surfaces.
[0018] Preferably, the main body has an oblong shape. The upper and lower surfaces of the
main body are formed with serrated surfaces. The main body has a transverse slot extending
backward from a front end thereof to form the two movable support units relative to
the upper and lower walls of the transverse slot. Each movable support unit is split
by at least one groove to form a movable support surface and a frame-shaped movable
support surface. One end of the movable support surface is connected with the inner
edge of the frame-shaped movable support surface. An open end of the transverse slot
is formed with an enlarged portion for the push block to be transversely disposed
and screwed to the distal end of the screw. The inner surfaces of the movable support
surface have guide surfaces connecting the transverse slot and the enlarged portion
respectively. The guide surfaces are spaced at an interval. The guide surface of the
innermost movable support surface is against the inner surface of the push block.
When the screw is rotated to bring the push block to move inward, the push block is
guided by the guide surfaces to expand the movable support surfaces in a staged manner,
so that the movable support units are expanded at an angle to hold two adjacent vertebral
bodies in place.
[0019] Preferably, the frame-shaped movable support surface is formed with a stop flange
facing the open end of the transverse slot, such that the two stop flanges of the
frame-shaped movable support surfaces of the two movable support units are adapted
to stop the outer surface of the push block to prevent the push block from falling
off outward.
[0020] Alternatively, the main body has a cylindrical shape or a hollow pillar shape having
at least four sides. The outer surface of the main body is formed with a serrated
surface. The main body has a split groove extending backward from a front end thereof
to form at least two spaced movable support units. Each movable support unit is split
by at least one groove to form at least one movable support surface and a frame-shaped
movable support surface, the main body has a central axial hole. The front end of
the axial hole is formed with an enlarged portion for a spherical push block to be
accommodated and screwed to the distal end of the screw. The inner surfaces of the
movable support surfaces have guide surfaces connecting the axial hole and the enlarged
portion, respectively. The guide surfaces are spaced at an interval. The guide surface
of the outermost frame-shaped movable support surface is at the forefront to be against
the inner surface of the push block. When the screw is rotated to bring the push block
to move inward, the push block is guided by the guide surfaces to expand the movable
support surfaces in a staged manner, so that the movable support units disposed radially
are expanded at an angle to hold two adjacent vertebral bodies in place.
[0021] Alternatively, the main body has an oblong shape. The upper and lower surfaces of
the main body are formed with serrated surfaces. The main body has a transverse slot
formed at a central section of a side wall thereof. The transverse slot has a dual-stepped
shape having a wide outside and a narrow inside. The front end of the transverse slot
is formed with an enlarged portion for the push block to be transversely disposed
and screwed to the distal end of the screw. The upper and lower walls of the main
body, relative to the transverse slot, are split by grooves to form two movable support
units and two spaced upper and lower fixed frames. One end of the movable support
surface is connected with the inner edge of the frame-shaped movable support surface.
Each movable support unit is split by a groove to form at least two movable support
surface which are gradually reduced from outside to inside. The inner surfaces of
the movable support surface have guide surfaces connecting the transverse slot and
the enlarged portion, respectively. The guide surfaces are spaced at an interval.
The guide surface of the innermost movable support surface is at the forefront to
be against the inner surface of the push block. When the screw is rotated to bring
the push block to move inward, the upper and lower fixed frames are immovable and
the push block is guided by the guide surfaces of the movable support units to expand
the movable support surfaces in a staged manner, so that the movable support units
disposed between the upper and lower fixed frames are expanded at an angle to hold
two adjacent vertebral bodies in place.
[0022] Alternatively, the main body has a cylindrical shape or a hollow pillar shape having
at least four sides. The surface of one end of the main body is split by grooves to
form at least two spaced movable support units and a fixed frame. One end of the movable
support surface is connected with the inner edge of the frame-shaped movable support
surface. Each movable support unit is split by at least one groove to form at least
two movable support surfaces which are gradually reduced from outside to inside. The
main body has a central axial hole. The front end of the axial hole is formed with
an enlarged portion for a spherical push block to be accommodated and screwed to the
distal end of the screw. The inner surfaces of the movable support surfaces have guide
surfaces connecting the axial hole and the enlarged portion, respectively. The guide
surfaces are spaced at an interval. The guide surface of the outermost movable support
surface is at the forefront to be against the inner surface of the push block. When
the screw is rotated to bring the push block to move inward, the fixed frame is immovable
and the push block is guided by the guide surfaces of the movable support surfaces
to expand the movable support surfaces in a staged manner, so that the movable support
units disposed radially are expanded at an angle to hold two adjacent vertebral bodies
in place.
[0023] Compared to the prior art, the present invention provides the movable support surfaces
having a staged expansion structure. When the screw is rotated to move the push block,
one of the movable support surfaces is first expanded by the push block, and then
the other movable support surfaces are continuously expanded at an appropriate angle.
Thus, the applied force of the graft operation can be dispersed effectively. The present
invention is adjustable for the height of the vertebra, which can be adapted for most
people. The present invention is labor-saving, precise, and quick for a graft operation.
BRIEF DESCRIPTION OF THE DRAWINGS
[0024]
Fig. 1 is a perspective view accordingly to a first embodiment of the present invention;
Fig. 2 is a top view accordingly to the first embodiment of the present invention;
Fig. 3 is a schematic view of the first embodiment of the present invention coupled
with the push block;
Figs. 4-6 are schematic views showing the expansion operation of the first embodiment
of the present invention;
Fig. 7 is a schematic view showing the three-stage guide surfaces accordingly to the
first embodiment of the present invention;
Fig. 8 is a schematic view showing the inclined guide surfaces accordingly to the
first embodiment of the present invention;
Fig. 9 is a schematic view showing the inclined stepped guide surfaces accordingly
to the first embodiment of the present invention;
Fig. 10 is a schematic view showing the curved guide surfaces accordingly to the first
embodiment of the present invention;
Fig. 11 is a perspective view accordingly to a second embodiment of the present invention;
Fig. 12 is a sectional view accordingly to the second embodiment of the present invention;
Fig. 13 is a perspective view accordingly to a third embodiment of the present invention;
Fig. 14 is a sectional view accordingly to the third embodiment of the present invention;
Fig. 15 is a perspective view accordingly to a fourth embodiment of the present invention;
and
Fig. 16 is a sectional view accordingly to the fourth embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0025] Embodiments of the present invention will now be described, by way of example only,
with reference to the accompanying drawings.
[0026] The staged expansion vertebra retaining device of the present invention is made of
titanium, tantalum, stainless steel, ceramics, aluminium oxide, PE, PU, PEEK, or silicon,
which has better biocompatibility and mechanical property.
[0027] As shown in Fig. 1 to Fig. 6, the staged expansion vertebra retaining device according
to a first embodiment of the present invention comprises a main body 10 and a screw
20 inserted into the main body 10. The distal end of the screw 20 is coupled with
a push block 21. The main body 10 has an oblong shape. In the drawings, a lumbar vertebra
graft is as an example, but not limited to. The upper and lower surfaces of the main
body 10 are formed with serrated surfaces 11. The main body 10 has a transverse slot
12 extending backward from a front end thereof to form two spaced movable support
units 14. Each movable support unit 14 is split by at least one groove 13 to form
a movable support surface 141 and a frame-shaped movable support surface 142. The
groove 13 and the movable support surface 141 have a U shape as shown in the drawings,
but not limited to. One end of the movable support surface 141 is connected with an
inner edge of the frame-shaped movable support surface 142. An open end of the transverse
slot 12 is formed with an enlarged portion 121 for the push block 21 to be transversely
disposed and screwed to the distal end of the screw 20. Referring to Fig. 3, the inner
surfaces of the movable support surfaces 141, 142 have guide surfaces 1411, 1421 connecting
the transverse slot 12 and the enlarged portion 121, respectively. The guide surfaces
1411, 1421 are spaced at an interval. As shown in the drawings, the guide surfaces
1411, 1421 are inclined surface, but not limited to. The guide surface 1411 of the
innermost movable support surface 141 is against the inner surface of the push block
21. The frame-shaped movable support surface 142 is formed with a stop flange 1422
facing the open end of the transverse slot 12, such that the two stop flanges 1422
of the frame-shaped movable support surfaces 142 of the two movable support units
14 are adapted to stop the outer surface of the push block 21 to prevent the push
block 21 from falling off outward. The inner end of the transverse slot 12 communicates
with a vertical hole 15, so that it is more labor-saving for installation and expansion
of the movable support surfaces 141, 142. Furthermore, the middle of the movable support
surface 141 is formed with a middle hole 1412 for receiving autologous osteophyte
and artificial bone issue during a surgical operation.
[0028] Referring to Fig. 4, when the present invention is installed, the push block 21 of
the present invention is normally against the guide surface 1411 of the innermost
movable support surface 141. When the present invention is grafted in between two
vertebral bodies (not shown), the screw 20 is rotated by a tool (not shown) to bring
the push block 21 to move inward and push the guide surface 1411 of the innermost
movable support surface 141 so that the innermost movable support surface 141 is first
expanded at an appropriate angle. Referring to Fig. 5, when the push block 21 is translated
to move inward until the guide surface 1421 of the outermost movable support surface
142, the movable support surfaces 141, 142 are simultaneously expanded outward by
the push block 21, as shown in Fig. 6. Thus, the movable support surfaces 141, 142
can be expanded fully in a staged manner from inside to outside. That is to say, the
present invention uses the push block 21 to expand the innermost movable support surface
141 to hold two adjacent vertebral bodies (not shown) first. When it is expanded continuously
until the predetermined route, the outermost movable support surface 142 will be expanded
simultaneously. Through each movable support surface having a staged expansion structure,
the operation force can be dispersed effectively. The graft operation can be first
applied with an appropriate force, namely, the innermost movable support surface 141
is first to hold two adjacent vertebral bodies (not shown) to prevent the graft from
sliding. The present invention is labor-saving, precise, and quick for a graft operation.
[0029] Referring to Fig. 7 and Fig. 8, each movable support unit 14 of the first embodiment
of the present invention is split by the grooves 13 to form three movable support
surfaces 142, 141, 143 which are disposed from outside to inside and gradually reduced
to disperse the applied force in a three-stage manner. The guide surfaces 1421, 1411,
1431 at the open ends of the three movable support surfaces 142, 141, 143 can be inclined
guide surfaces; or the guide surfaces 1421a, 1411a, 1431a can be inclined stepped
guide surfaces, as shown in Fig. 9; or the guide surfaces 1421b, 1411b, 1431b can
be curved guide surfaces, as shown in Fig. 10.
[0030] As shown in Fig. 11 to Fig. 12, the staged expansion vertebra retaining device according
to a second embodiment of the present invention comprises a main body 30 and a screw
20 inserted into the main body 30. The distal end of the screw 20 is coupled with
a spherical push block 21a. The main body 30 has a cylindrical shape or a hollow pillar
shape having at least four sides. The outer surface of the main body 30 is formed
with a serrated surface 31. The main body 30 has a split groove 32 extending backward
from a front end thereof to form at least two spaced movable support units 33. Each
movable support unit 33 is split by at least one groove 335 to form at least one movable
support surface. In this embodiment, the main body 30 has three movable support surfaces
331, 332, 333 and a frame-shaped movable support surface 334. The groove 335 and the
movable support surfaces 331, 332, 333 have a U shape as shown in the drawings, but
not limited to. The main body 30 has a central axial hole 34. The front end of the
axial hole 34 is formed with an enlarged portion 35 for the push block 21a to be accommodated
and screwed to the distal end of the screw 20. The inner surfaces of the movable support
surfaces 331, 332, 333, 334 have guide surfaces 3311, 3321, 3331, 3341 connecting
the axial hole 34 and the enlarged portion 35, respectively. The guide surfaces 3311,
3321, 3331, 3341 are spaced at an interval, respectively. The guide surface 3341 of
the outermost movable support surface 334 is at the forefront to be against the inner
surface of the push block 21a. When the screw 20 is rotated to bring the push block
21a to move inward, the push block 21a is guided by the guide surfaces 3341, 3311,
3321, 3331 to expand the movable support surfaces 334, 331, 332, 333 in a staged manner,
so that the movable support units 33 disposed radially are expanded at an appropriate
angle to hold two adjacent vertebral bodies (not shown) in place.
[0031] The present invention can keep the main body immobile, and only the movable support
units disposed on the main body are expanded in between two vertebral bodies. As shown
in Fig. 13 and Fig. 14, the staged expansion vertebra retaining device according to
a third embodiment of the present invention comprises a main body 40 and a screw 20
inserted into the main body 40. The distal end of the screw 20 is coupled with a push
block 21. The main body 40 has an oblong shape. The upper and lower surfaces of the
main body 40 are formed with serrated surfaces 41. The main body 40 has a transverse
slot 42 formed at a central section of a side wall thereof. The transverse slot 42
has a dual-stepped shape having a wide outside and a narrow inside. A front end of
the transverse slot 12 is formed with an enlarged portion 43 for the push block 21
to be transversely disposed and screwed to the distal end of the screw 20. The upper
and lower walls of the main body 40, relative to the transverse slot 40, are split
by grooves 44 to form two movable support units 45 and two spaced upper and lower
fixed frames 46. One end of each movable support unit 45 is connected with the inner
edge of the corresponding fixed frame 46. Each movable support unit 45 is split by
at least one groove 44 to form at least two movable support surface which are gradually
reduced from outside to inside. As shown in the drawings, each movable support unit
45 has two movable support surfaces 451, 452. The movable support units 45, the movable
support surface 451, 452, and the groove 44 have a U shape as shown in the drawings,
but not limited to. The inner surfaces of the movable support surface 451, 452 have
guide surfaces 4511, 4521 connecting the transverse slot 42 and the enlarged portion
43, respectively. The guide surfaces 4511, 4521 are spaced at an interval. The guide
surface 4521 of the innermost movable support surface 452 is at the forefront to be
against the inner surface of the push block 21. When the screw 20 is rotated to bring
the push block 21 to move inward, the upper and lower fixed frames 46 are immovable
and the push block 21 is guided by the guide surfaces 4511, 4521 of the movable support
units 451, 452 to expand the movable support surfaces 451, 452 in a staged manner,
so that the movable support units 45 disposed between the upper and lower fixed frames
46 are expanded at an appropriate angle to hold two adjacent vertebral bodies (not
shown) in place.
[0032] As shown in Fig. 15 to Fig. 16, the staged expansion vertebra retaining device according
to a fourth embodiment of the present invention comprises a main body 50 and a screw
20 inserted into the main body 50. The distal end of the screw 20 is coupled with
a spherical push block 21a. The main body 50 has a cylindrical shape or a hollow pillar
shape having at least four sides. The outer surface of the main body 50 is formed
with a serrated surface 51. The surface of one end of the main body 50 is split by
a groove 52 to form at least two spaced movable support units 53. In this embodiment,
the main body 50 has three movable support units 53 and a fixed frame 54. One end
of each movable support unit 53 is connected with the inner edge of the fixed frame
54. Each movable support unit 53 is split by the same groove 52 to form at least two
movable support surfaces. In this embodiment, the main body 50 has three movable support
surfaces 531, 532, 533. The movable support units 53, the movable support surfaces
531, 532, 533 and the groove 52 have a U shape as shown in the drawings, but not limited
to. The main body 50 has a central axial hole 55. The front end of the axial hole
55 is formed with an enlarged portion 551 for the push block 21a to be accommodated
and screwed to the distal end of the screw 20. The inner surfaces of the movable support
surfaces 531, 532, 533 have guide surfaces 5311, 5321, 5331 connecting the axial hole
55 and the enlarged portion 551, respectively. The guide surfaces 5311, 5321, 5331
are spaced at an interval, respectively. The guide surface 5311 of the outermost movable
support surface 531 is at the forefront to be against the inner surface of the push
block 21a. When the screw 20 is rotated to bring the push block 21a to move inward,
the fixed frame 54 is immovable and the push block 21a is guided by the guide surfaces
5311, 5321, 5331 of the movable support surfaces 531, 532, 533 to expand the movable
support surfaces 531, 532, 533 in a staged manner, so that the movable support units
53 disposed radially are expanded at an appropriate angle to hold two adjacent vertebral
bodies (not shown).
[0033] To sum up the aforesaid embodiments, the present invention provides the movable support
surfaces having a staged expansion structure. When the screw is rotated to move the
push block, one of the movable support surfaces is first expanded by the push block,
and then the other movable support surfaces are continuously expanded at an appropriate
angle. Thus, the applied force of the graft operation can be dispersed effectively.
The present invention is adjustable for the height of the vertebra, which can be applied
to most people. The present invention is labor-saving, precise, and quick for a graft
operation.
[0034] Although particular embodiments of the present invention have been described in detail
for purposes of illustration, various modifications and enhancements may be made without
departing from the present invention. Accordingly, the present invention is not to
be limited except as by the appended claims.
1. A staged expansion vertebra retaining device, wherein the staged expansion vertebra
retaining device comprises a main body (10) and a screw (20) inserted into the main
body (10), a distal end of the screw (20) is provided with a push block (21), the
main body (10) has a transverse slot (12) extending backward from a front end thereof
to form at least two movable support units (14) relative to one side of the push block
(21), each movable support unit (14) is split by a groove (13) to form at least two
movable support surfaces (141, 142) which are able to be expanded in a staged manner
by the push block (21), so that the movable support units (14) are expanded at an
angle to hold two adjacent vertebral bodies in place, wherein an open end of the transverse
slot (12) is formed with an enlarged portion (121) for the push block (21) to be transversely
disposed and screwed to the distal end of the screw (20), characterized in that
the at least two movable support surfaces (141, 142) comprise a movable support surface
(141) which is an innermost movable support surface (141) and a frame-shaped moveable
support surface (142) which is an outermost movable support surface (142), and the
inner surfaces of the movable support surfaces (141, 142) have at least two guide
surfaces (1411, 1421) connecting the transverse slot (12) and the enlarged portion
(121) and spaced at an interval for guiding the push block (21), by bringing the push
block (21) to move inward the first guide surface (1411) is pushed so that the innermost
movable support surface (141) is first expanded at an appropriate angle and when the
push block (21) is translated to move inward until the guide surface (1421) of the
outermost movable support surface (142), the movable support surfaces (141, 142) are
simultaneously expanded outward by the push block (21).
2. The staged expansion vertebra retaining device as claimed in claim 1, wherein the
guide surfaces (1411a, 1421a) are inclined stepped guide surfaces.
3. The staged expansion vertebra retaining device as claimed in claim 1, wherein the
guide surfaces (1411, 1421) are inclined guide surfaces.
4. The staged expansion vertebra retaining device as claimed in claim 1, wherein the
guide surfaces (1411b, 1421b) are curved guide surfaces.
5. The staged expansion vertebra retaining device as claimed in any one of claims 1-4,
wherein the main body (10) has an oblong shape, upper and lower surfaces of the main
body (10) are formed with serrated surfaces (11), the two movable support units (14)
being formed relative to upper and lower walls of the transverse slot (12), the guide
surface (1411) of the innermost movable support surface (141) is against an inner
surface of the push block (21), when the screw (20) is rotated to bring the push block
(21) to move inward, the guide surfaces (1411, 1421) are expanded in a staged manner,
so that the movable support units (14) are expanded at an angle to hold two adjacent
vertebral bodies in place.
6. The staged expansion vertebra retaining device as claimed in claim 5, wherein the
frame-shaped movable support surface (142) is formed with a stop flange (1422) facing
the open end of the transverse slot (12), such that two stop flanges (1422) of the
frame-shaped movable support surfaces (142) of the two movable support units (14)
are adapted to stop an outer surface of the push block (21) to prevent the push block
(21) from falling off outward.
7. The staged expansion vertebra retaining device as claimed in any one of claims 1-4,
wherein the main body (30) has a cylindrical shape or a hollow pillar shape having
at least four sides, an outer surface of the main body (30) is formed with a serrated
surface (31), the main body (30) has a central axial hole (34), a front end of the
axial hole (34) is formed with an enlarged portion (35) for the push block (21a) to
be accommodated, wherein the push block (21a) is spherical, wherein the guide surfaces
(3311, 3341) connect the axial hole (34) and the enlarged portion (35) respectively,
the guide surface (3341) of the outermost frame-shaped movable support surface (334)
is at the forefront to be against an inner surface of the push block (21a), when the
screw (20) is rotated to bring the push block (21a) to move inward, the guide surfaces
(3341, 3311) are expanded in a staged manner, so that the movable support units (33)
disposed radially are expanded at an angle to hold two adjacent vertebral bodies in
place.
1. Eine gestuft ausweiterbare Wirbelhaltevorrichtung, wobei die gestuft ausweiterbare
Wirbelhaltevorrichtung einen Hauptteil (10) und eine in den Hauptteil (10) eingesetzte
Schraube (20) umfasst; am distalen Ende der Schraube (20) ein Druckblock (21) vorgesehen
ist, der Hauptteil (10) einen Querschlitz (12) aufweist, der sich von dessen vorderen
Ende nach hinten erstreckt, um mindestens zwei bewegliche Unterstützungseinheiten
(14) zu bilden, die relativ zu einer Seite des Druckblocks (21) angeordnet sind; jede
bewegliche Unterstützungseinheit (14) durch eine Nut (13) in mindestens zwei bewegliche
Tragflächen (141, 142) geteilt wird, die mit einem Druckblock (21) gestuft ausgeweitet
werden können, um die beweglichen Unterstützungseinheiten (14) in einen Winkel auszuweiten
und somit zwei angrenzende Wirbelkörper vor Ort festzuhalten, während ein offenes
Ende des Querschlitzes (12) mit einem vergrößerten Teil (121) gebildet ist, um den
Druckblock (21) quer anzuordnen und an das distale Ende der Schraube (20) anzuschrauben,
dadurch gekennzeichnet, dass
die mindestens zwei beweglichen Tragflächen (141, 142) eine bewegliche Tragfläche
(141) umfassen, die eine innerste bewegliche Tragfläche (141) und eine bewegliche
Tragfläche (142) in Rahmenform ist, die eine äußerste bewegliche Tragfläche (142)
ist, wobei die Innenflächen der beweglichen Tragflächen (141, 142) mindestens zwei
Führungsflächen (1411, 1421) aufweisen, mit denen der Querschlitz (12) und der vergrößerte
Teil (121) verbunden und in einem Abstand angeordnet sind, um den Druckblock (21)
zu führen; durch Bewegen des Druckblocks (21) nach innen die erste Führungsfläche
(1411) angeschoben wird, damit die innerste bewegliche Tragfläche (141) zuerst in
einem geeigneten Winkel ausgeweitet wird, wobei beim Übertragen des Druckblocks (21)
dieser nach innen bis zur Führungsfläche (1421) der äußerten beweglichen Tragfläche
(142) bewegt wird, wobei die beweglichen Tragflächen (141, 142) mit dem Druckblock
(21) gleichzeitig nach außen bewegt werden.
2. Die gestuft ausweiterbare Wirbelhaltevorrichtung nach Anspruch 1, wobei die Führungsflächen
(1411a, 1421a) als geneigte und stufige Führungsflächen gebildet sind.
3. Die gestuft ausweiterbare Wirbelhaltevorrichtung nach Anspruch 1, wobei die Führungsflächen
(1411, 1421) als geneigte Führungsflächen gebildet sind.
4. Die gestuft ausweiterbare Wirbelhaltevorrichtung nach Anspruch 1, wobei die Führungsflächen
(1411b, 1421b) als gebogene Führungsflächen gebildet sind.
5. Die gestuft ausweiterbare Wirbelhaltevorrichtung nach einem der Ansprüche 1-4, wobei
der Hauptteil (10) eine längliche Form aufweist; die oberen und unteren Oberflächen
des Hauptteils (10) mit gezackten Oberflächen (11) gebildet sind; die zwei beweglichen
Unterstützungseinheiten (14) relativ zu den oberen und unteren Wänden des Querschlitzes
(12) gebildet sind; die Führungsfläche (1411) der innersten beweglichen Tragfläche
(141) gegen eine Innenfläche des Druckblocks (21) andrückt; beim Rotieren der Schraube
(20), um den Druckblock (21) nach innen zu bewegen, die Führungsflächen (1411, 1421)
gestuft ausgeweitet werden, so dass die beweglichen Unterstützungseinheiten (14) in
einem Winkel ausgeweitet werden, um zwei anstoßende Wirbelkörper vor Ort festzuhalten.
6. Die gestuft ausweiterbare Wirbelhaltevorrichtung nach Anspruch 5, wobei die bewegliche
Tragfläche (142) in Rahmenform gegenüber dem offenen Ende des Querschlitzes (12) mit
einem Anschlagflansch (1422) gebildet ist, so dass die zwei Anschlagflansche (1422)
der beweglichen Tragflächen (142) in Rahmenform der beweglichen Unterstützungseinheiten
(14) zum Anhalten einer Außenfläche des Druckblocks (21) geeignet sind, um ein Hinausfallen
des Druckblocks (21) zu vermeiden.
7. Die gestuft ausweiterbare Wirbelhaltevorrichtung nach einem der Ansprüche 1-4, wobei
der Hauptteil (30) eine zylindrische oder hohle Kissenform mit mindestens vier Seiten
aufweist; eine Außenfläche des Hauptteils (30) mit einer gezackten Oberfläche (31)
gebildet ist; der Hauptteil (30) eine Axialbohrung (34) in der Mitte aufweist; ein
vorderes Ende der Axialbohrung (34) mit einem vergrößerten Teil (35) gebildet ist,
um den Druckblock (21a) aufzunehmen, wobei der Druckblock (21a) kugelförmig ist; wobei
die Führungsflächen (3311, 3341) die Axialbohrung (34) bzw. den vergrößerten Teil
(35) verbinden; die Führungsfläche (3341) der äußersten beweglichen Tragfläche (334)
in Rahmenform auf der Vorderseite ist, um an eine Innenfläche des Druckblocks (21a)
anzudrücken; beim Rotieren der Schraube (20), um den Druckblock (21a) nach innen zu
bewegen, die Führungsflächen (3341, 3311) auf eine gestufte Weise ausgeweitet werden,
damit die bewegliche Unterstützungseinheiten (33) radial in einem Winkel ausgeweitet
werden, um die beiden angrenzenden Wirbelkörper vor Ort festzuhalten.
1. Dispositif de retenue de vertèbre en expansion en plusieurs étapes, caractérisé par le fait que le dispositif de retenue de vertèbre en expansion en plusieurs étapes comprend un
corps principal (10) et une vis (20) insérée dans le corps principal (10), une extrémité
distale de la vis (20) est munie d'un bloc poussoir (21), le corps principal (10)
comporte une fente transversale (12) s'étendant vers l'arrière à partir de son extrémité
avant pour former au moins deux unités de support mobiles (14) par rapport à un côté
du bloc poussoir (21), chaque unité de support mobile (14) est divisée par une rainure
(13) pour former au moins deux surfaces de support mobiles (141, 142) qui peuvent
être étendues de manière progressive par le bloc poussoir (21), de sorte que les unités
de support mobiles (14) sont étendues à un angle pour maintenir en place deux corps
vertébraux adjacents, une extrémité ouverte de la fente transversale (12) est formée
avec une partie élargie (121) pour que le bloc poussoir (21) soit disposé transversalement
et vissé sur l'extrémité distale de la vis (20),
caractérisé en ce que
les deux, ou plus, surfaces de support mobiles (141, 142) comprennent une surface
de support mobile (141) qui est une surface de support mobile la plus proche de l'intérieur
(141) et une surface de support mobile en forme de cadre (142) qui est une surface
de support mobile la plus proche de l'extérieur (142), et les surfaces internes des
surfaces de support mobiles (141, 142) comportent au moins deux surfaces de guidage
(1411, 1421) reliant la fente transversale (12) et la partie élargie (121) et espacées
à un intervalle pour guider le bloc poussoir (21), en amenant le bloc poussoir (21)
à se déplacer vers l'intérieur, la première surface de guidage (1411) est poussée
de sorte que la surface de support mobile la plus proche de l'intérieur (141) est
d'abord étendue à un angle approprié et lorsque le bloc poussoir (21) est transféré
pour se déplacer vers l'intérieur jusqu'à ce que la surface de guidage (1421) de la
surface de support mobile la plus proche de l'extérieur (142), les surfaces de support
mobiles (141, 142) sont simultanément étendues vers l'extérieur par le bloc poussoir
(21).
2. Dispositif de retenue de vertèbre en expansion en plusieurs étapes selon la revendication
1, caractérisé par le fait que les surfaces de guidage (1411a, 1421a) sont des surfaces de guidage à étages inclinés.
3. Dispositif de retenue de vertèbre en expansion en plusieurs étapes selon la revendication
1, caractérisé par le fait que les surfaces de guidage (1411, 1421) sont des surfaces de guidage inclinées.
4. Dispositif de retenue de vertèbre en expansion en plusieurs étapes selon la revendication
1, caractérisé par le fait que les surfaces de guidage (1411b, 1421b) sont des surfaces de guidage incurvées.
5. Dispositif de retenue de vertèbre en expansion en plusieurs étapes selon l'une quelconque
des revendications 1-4, caractérisé par le fait que le corps principal (10) comporte une forme oblongue, les surfaces supérieure et inférieure
du corps principal (10) sont formées de surfaces dentelées (11), les deux unités de
support mobiles (14) étant formées par rapport aux parois supérieure et inférieure
de la fente transversale (12), la surface de guidage (1411) de la surface de support
mobile la plus proche de l'intérieur (141) est contre une surface intérieure du bloc
poussoir (21), lorsque la vis (20) est tournée pour amener le bloc poussoir (21) à
se déplacer vers l'intérieur, les surfaces de guidage (1411, 1421) sont étendues de
manière progressive, de sorte que les unités de support mobiles (14) sont étendues
à un angle pour maintenir en place deux corps vertébraux adjacents.
6. Dispositif de retenue de vertèbre en expansion en plusieurs étapes selon la revendication
5, caractérisé par le fait que la surface de support mobile en forme de cadre (142) est formée avec une bride de
butée (1422) à l'opposé de l'extrémité ouverte de la fente transversale (12), de sorte
que deux brides de butée (1422) des surfaces de support mobile en forme de cadre (142)
des deux unités de support mobiles (14) sont adaptées pour arrêter une surface extérieure
du bloc poussoir (21) pour empêcher le poussoir de bloc (21) de tomber vers l'extérieur.
7. Dispositif de retenue de vertèbre en expansion en plusieurs étapes selon l'une quelconque
des revendications 1-4, caractérisé par le fait que le corps principal (30) comporte une forme cylindrique ou une forme de pilier creux
ayant au moins quatre côtés, une surface extérieure du corps principal (30) est formé
avec une surface dentelée (31), le corps principal (30) comporte un trou axial central
(34), une extrémité avant du trou axial (34) est formé avec une partie élargie (35)
pour accueillir le bloc poussoir (21a), le bloc poussoir (21a) est sphérique, les
surfaces de guidage (3311, 3341) relient le trou axial (34) et la partie élargie (35)
respectivement, la surface de guidage (3341) de la surface de support mobile en forme
de cadre la plus proche de l'extérieur (334) est en première ligne pour être contre
une surface intérieure du bloc poussoir (21a), lorsque la vis (20) est tournée pour
amener le bloc poussoir (21a) à se déplacer vers l'intérieur, les surfaces de guidage
(3341, 3311) sont étendues de manière progressive, de sorte que les unités de support
mobiles (33) disposées radialement sont étendues à un angle pour maintenir en place
deux corps vertébraux adjacents.